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RESEARCH PAPERS: Natural Mixed Convection

Analysis of Combined Forced and Free Flow in a Vertical Channel With Viscous Dissipation and Isothermal-Isoflux Boundary Conditions

[+] Author and Article Information
A. Barletta

Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale (DIENCA), Università di Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy

J. Heat Transfer 121(2), 349-356 (May 01, 1999) (8 pages) doi:10.1115/1.2825987 History: Received August 04, 1998; Revised December 14, 1998; Online December 05, 2007

Abstract

Fully developed and laminar mixed convection in a parallel-plate vertical channel is investigated in the case of non-negligible viscous heating. The channel walls are subjected to asymmetric boundary conditions: One wall experiences a constant and uniform heat flux, while the other is kept at a uniform and constant temperature. The velocity field and the temperature field are evaluated analytically by means of perturbation expansions with respect to a buoyancy parameter, i.e., the ratio between the Grashof number and the Reynolds number. The Nusselt numbers and the friction factors are obtained as functions of the buoyancy parameter.

Copyright © 1999 by The American Society of Mechanical Engineers
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